We report studies on both target and projectile K-shell ionization by collisions of Cu9＋ ions on the thin Zn target in the energy range of 60-100 MeV. In this work, the relative ratio for the production of the target...We report studies on both target and projectile K-shell ionization by collisions of Cu9＋ ions on the thin Zn target in the energy range of 60-100 MeV. In this work, the relative ratio for the production of the target to projectile K-vacancy is measured. The result shows that it almost remains stable over this energy range and has good consistency with the predictions by vacancy transfer via the 2po-lscr rotational coupling, which gives experimental evidence for K-vacancy sharing between two partners. Furthermore, the discussion for comparisons between the experimental ionization cross sections and the possible theoretical estimations is presented. These comparisons suggest that the experimental data agree well with those predicted by the Binary-Encounter approximation （BEA） model but are not in good agreement with the modified BEA calculations. It allows us to infer that the direct ionization （and/or excitation） is of importance to initial K-vacancy production before 2po-lso transitions in the present collision condition.展开更多
基金Project supported by the Joint Funds of the National Natural Science Foundation of China(Grant No.U1332122)
文摘We report studies on both target and projectile K-shell ionization by collisions of Cu9＋ ions on the thin Zn target in the energy range of 60-100 MeV. In this work, the relative ratio for the production of the target to projectile K-vacancy is measured. The result shows that it almost remains stable over this energy range and has good consistency with the predictions by vacancy transfer via the 2po-lscr rotational coupling, which gives experimental evidence for K-vacancy sharing between two partners. Furthermore, the discussion for comparisons between the experimental ionization cross sections and the possible theoretical estimations is presented. These comparisons suggest that the experimental data agree well with those predicted by the Binary-Encounter approximation （BEA） model but are not in good agreement with the modified BEA calculations. It allows us to infer that the direct ionization （and/or excitation） is of importance to initial K-vacancy production before 2po-lso transitions in the present collision condition.
